Surussk is pretty sure there is more going on here than credits, and he missed whatever started it all. However, he figures his role at this point is to look angry with the "thief", which will be easy. Annoyed with himself (a warrior must always be aware of what goes on around him - missing things like this could be fatal), Surussk transfers his anger at his own inattention to the "thief" and glares at him.